By R.W. Stowe, Director of Applications Engineering, Heraeus Noblelight America LLC Question: I plan to experiment with LEDs. Will I need a different radiometer from what I am using? Answer: Yes. Medium-pressure (MP) mercury lamps emit UV over a very wide region of the UV spectrum. There are few instruments that can capture the emitted energy over the entire UV … [Read more...] about UV QAs: LEDs and Radiometers; Non-Reciprocity and Design or QC; Radiachromic Films
UV Curing
Improving the Adhesion of UV Liquid and Powder Coatings Using Plasma Treatment
by Andy Stecher, Plasmatreat North America and Paul Mills, industry consultant UV-cured liquid and powder coatings provide plastic part manufacturers with a number of attractive benefits, including improved performance; enhanced appearance; reduced environmental, health and safety risks; and various process advantages. At the same time, the rapid film formation and densely … [Read more...] about Improving the Adhesion of UV Liquid and Powder Coatings Using Plasma Treatment
Properties of Silicone Modified UV-Cured Acrylate and Epoxy Coatings Films
by Drs. Bob Ruckle and Tom Seung-Tong Cheungm, Siltech Corporation A wide variety of polymers are used as resins in coatings systems. Often defined by their reactive groups, the myriad of resins offer a wide-range of properties. In the coatings industry, acrylate, epoxy, urethane and polyester coatings are all quite common and have associated typical properties and … [Read more...] about Properties of Silicone Modified UV-Cured Acrylate and Epoxy Coatings Films
Q&A: EB-Curing Technology
by Stephen C. Lapin, PCT Engineered Systems LLC Question: What are the Fundamental Differences Between UV and EB Technology? Answer: Ultraviolet (UV) and electron beam (EB) curing technologies are often grouped together. This is certainly the case in this new publication, UV+EB Technology. The main reason the technologies are considered together is that UV and EB energy can … [Read more...] about Q&A: EB-Curing Technology
Interaction of Photoexcited Photoinitiators with Nitroxyl Radicals
by Dr. Igor V. Khudyakov, Catawba County, North Carolina Introduction Formulations that undergo photopolymerization have, in most cases, photoinitiators (PIs) such as benzophenone and others. These formulations may have nitroxyl (aminoxyl) radicals, which are added for prevention of degradation of the cured coatings. Nitroxyls also are formed during oxidation of hindered … [Read more...] about Interaction of Photoexcited Photoinitiators with Nitroxyl Radicals